Why must we immediately check the value of errno after a, Computer Engineering

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Why must we immediately check the value of errno after a

Problem

1. Explain the difference between system calls and library functions. What happens in the CPU when a system call is invoked?

2. Why must we immediately check the value of errno after a system call fails, rather than later?

3. What is a file descriptor, and what is it used for?

4. Check the man pages of open, dup, dup2, pipe, and fcntl and see if you find anything they have in common.

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